Hydraulic apparatus



Patented Sept. 16, 1952 i 7 A NITED STATES. NIieF we 2,610,949 J HYDRAULIC APPARATUS p Frank J. Sowa; Cranford, 'N} If.

No Drawing. Application septemli'eri's; 1948',

, 1 serial No. 49,125 I 3o1aims. (01,1 5 24 j 1 This invention relates to a y ic apparatus mal alkyl radicals having from four to six carbon by means of which mechanical forces are transt m of t phenyl radicai mitted or absorbed. Thus, the apparatus of this Thus, R, R and R" may suitably be the ninvention may be in the form of a hydraulic brake, butyl, isobutyl n-amyl n-hexyl 2-ethylhexyl hydraulic clutch, shock absorber, dash pot, vibra- 5 n-dodecyl mtetradewi, steeryi, ycloamyl cycletion dampener, artillery recoil mechanism, lifting hexyl o-methyl henyL m-ethylphenyl, t jack, door check, etc. Suitable specific organosilicon monofluorides of Certain characteristics are required in devices the aforementioned generic formula are which transmit or absorb mechanical forces using butyl fluorosilane, tri-isobutyl fluorosilane, tri-n a fluid medium. Thus, the fluid contained there- 10 amyl fluorosilane, triphenyl fluorosilane, tri-nin must be stable both chemically and physically. dodecyl fluorgsflane eyeiehexyl t fluoro- The fluid must not react With the o her parts of silane, phenyl di-isobutyl fluorosilane, tribenzyl the device with which it comes into contact, that flu r ii n behzyi 1 fluoro flane is, the fluid must not cause corrosion of exposed methylphenyl dicyclohexyl fl ii ne, t metal parts efieet any Substantial Swelling of The compounds of the aforementioned generic rubber p In addition, e Viscosity of the formula may be used alone as the hydraulic fluid fluid should remain within the workable limits or t may he used in admixture t up to about over a wide range of temperature, and should not an al weight of a comparable iluent which have any ten cy o gasify 1 solidify under does not hydrolyze or oxidize appreciably under h h r and low r t mp at r s, sp tiv ly. The the conditions of use. such a diluent may :be, for viscosity index of the fluid is of great importance, example, any of certain animal, Vegetable or in si ce t uniformity of operation of the device eral oils, particularly castor oil or lubricating W depend in great p p the uniformity of mineral oils. As a diluent there may also be used the V s y e fluid under temperature stable organic liquids having boiling points above changes The surface tension f the fluid 100 0., such as saturated aliphatic monohydric tained in the devi i also f importance, since alcohols having at least four carbon atoms, such the surface tension determines the facility with as fusel oil, 2-ethylhexano1, dodecyl alcohol, diwhich-the fluid Wets the bearing surface and acetone alcohol, the monoethyl ether of ethylene tends to Creep into the engaging rfaces when glycol, the monobutyl ether of ethylene glycol, the the mechanis s static. Moreover, it is of monomethyl ether of diethylene glycol, the monoportance that the fluid be one which shows a high butyl ether of diethylene glycol, etc. Ethylene resistance to hydrolysis under the conditions 0 glycol d th diethyl and dibutyl ethers thereof use. are also examples of suitable diluents. In fact,

It is therefore the object of the present invenany rganic liquid hi is miscible t t tion to provide a hydraulic device which meets organgsfljcon monoiiuoride, which has a 1 w the aforementioned r q i P r l in cosity and a relatively low vapor pressure at opthat the force transmitting or absorbing fluid crating temperatures, which does not caus apcontained h r possesses a W P r p h preciable swelling of rubber and which does not viscosity index, high surface tension, chemical react t metals may be used inertness and substantial oiliness. By Way of iiiustrating t invention a gun The aforementioned and other Objects are coil shock absorber is fllled with triamyl silicon co p in eeeerdenee with the present fluoride, which remains fluid from c. to

Vention by employing in cotlvemional hydrau' 150 C. and does not hydrolyze under the condilic apparatus a fluid comprising a compound of tions of the genetic formula 45 The present invention is directed to a hydraulic device which comprises essentially a cylinder or SiF chamber enclosing a piston and a fluid contained f in the cylinder or chamber, which fluid transmits or checks a mechanical force applied to the in which R, R and R" are alkyl radicals having from four to eighteen carbon atoms, cycloalkyl radicals having from five to eight carbon atoms, Thls aprfhcatlori 1S eentlhuetlen-in-pert of aryl hydrocarbon radicals having f six to my copending application, Serial No. 463,684, filed eight carbon atoms, the benzyl or phenyiethyi October 28, 1942, which issued September 14, 1948, radical. Preferably, R, R and R" are either noras Patent No. 2,449,335-

piston.

I claim:

1. A hydraulic apparatus comprising, in combination, a movable member and a liquid medium arranged in contact with said member, said liquid medium consisting essentially of at least one compound having the generic formula in which R, R and R" are substituents selected medium consists essentially of triamyl fluoro silane.

3. Apparatus as in claim 1 in which the liquid medium includes, in admixture with said compound, up to about an equal weight of said compound of an organic diluent having a boilinz point above 100 C., which has a low viscosity, which does not cause an appreciable swelling of rubber, and which does not react with metals.

FRANK J SOWA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS v Number Name Date 2,205,183 Woodhouse June 18, 1940 2,426,121 R1181) Bl) a1 Aug. 19, 1947 

1. A HYDRAULIC APPARATUS COMPRISING, IN COMBINATION, A MOVABLE MEMBER AND A LIQUID MEDIUM ARRANGED IN CONTACT WITH SAID MEMBER, SAID LIQUID MEDIUM CONSISTING ESSENTIALLY OF AT LEAST ONE COMPOUND HAVING THE GENERIC FORMULA 